n | a(n) |
---|---|
0 | 2 |
1 | 6 |
2 | 19 |
3 | 61 |
4 | 196 |
5 | 630 |
6 | 2026 |
7 | 6516 |
8 | 20957 |
9 | 67403 |
10 | 216786 |
11 | 697242 |
12 | 2242518 |
13 | 7212542 |
14 | 23197479 |
15 | 74609345 |
16 | 239963764 |
17 | 771788146 |
18 | 2482278709 |
19 | 7983677414 |
20 | 25677658524 |
21 | 82586271099 |
22 | 265619708576 |
23 | 854304579262 |
24 | 2747673800490 |
25 | 8837259564290 |
26 | 28423008798464 |
[2,6,19,61,196,630,2026,6516,20957,67403,216786, 697242,2242518,7212542,23197479,74609345, 239963764,771788146,2482278709,7983677414, 25677658524,82586271099,265619708576,854304579262, 2747673800490,8837259564290,28423008798464] |